The value of Troutons ratio (?b/Tb) for a number of substances is 21 (where, ?b = molal that of vaporisation of a substance at its normal boiling point, KCal/kg. mole and Tb = normal boiling point, K). The Kistyakowsky equation is used for calculation of Troutons ratio of _____________ liquids?

A. Polar

B. Non-polar

C. Both A. & B.

D. Neither A. nor B.

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